Step 5: More pictures

Step 6: Parts List

Here is a synopsis of the parts used. I get most of my parts from mouser.com I have them listed as: Mouser Part Number Item/Manufacturer Slight Descr...

This video can be found on youtube.
http://www.youtube.com/watch?v=h5n0rw8wo14
Check out the other one, and some other of my videos

This is merely an instructable to explain how this device operates. I hope everything is not too obfuscated.

This prototype consists of three 8x8” modules. Each module operates independently of each other. Each module consists of 4 “pixels”. Each pixel is 4 inches square and consists of 21 LEDs, two IR emitting diodes, and two IR photodiodes. The mode of sensing is active infrared.

Step 1: Infrared Sensor

The IR sensor is a simple voltage divider former by two parallel IR photodiodes which are wired reversed biased. When a photodiode is reversed biased (like an LED connected up backwards) it acts like a variable resistor which changes resistance with respect to the amount of light (mainly infrared light) falling on it. The high resistance of the second static value 1 Megohm (R2) provides a voltage divider with the dividing node rising in voltage with an increase in IR light falling onto the photodiodes(R1).

Seems bits of the program were somehow lost when the author copied it into the instructable. I copied it out by hand from the screenshots, which produces a syntactically correct program. You can get the working version from here: http://pastebin.com/UEawXgrz

I'm sorry for so many questions but the 511-L7805CV ST Linear Regulators - Standard 5.0V 1.0A Positive you use this for the 5 v in to uC, from the 24 V supply?, i ask you before for a wiring diagram with more accuracy, how i put it the component in the schematic

hi, cand you put a wiring diagram more explicit, what i looking for, is the pin on microcontroller , connection between components and how connect 2 module.(which ones are the IR emitters and ir photodiodes on your schematic)

No my friend.He haven't send it yet.I don't know why. Did you try to compile his code? I tried a lot times.But the code which he given here is wrong.Its not working and even its not compiling..So many errors. Please if you got right code let me know. my email : slwthr@yahoo.com

Hello,I really want to make this one.And also I collect all the parts..And waiting to know about how to compile this code.Really I tried a lot times and it says errors and warnings too.Please can you tell me how to compile this code without any trouble.There is some errors with the functions.Please do you have any compiled hex code for this?? If you have please send it to me.My email: slwthr@yahoo.com

I saw a related Instructable where the guy used peg board, but even if they are, I'd rather take a drill and make all of them a little bit bigger just so everything is even. I'm going to try to make this project for part of a light show I'm making for a contest. If you've ever head of Phoenix Contact, they hold a contest every year for high school kids to use their Nanoline microcontroller and any Phoenix parts to build a project. First place goes to Germany and gets their own booth at the Hanover Industrial Trade Fair in Hanover, Germany. My team won this year and I just got back Saturday :) I'm going to try to use this idea to use for the floor of the room, with frosted Plexiglass on top. I'm also going to try to make the light create a rippling effect from the point where the person steps on. Wish me luck and I can ensure you that I'll post any questions I have and a video of the finished thing, if my team decides to take the idea

Hello Grahmaustin,first off, I must say that this is a great project !! Well done man !! But could you answer me one thing ? I was looking at the schematic and the board layout, and was trying to figure out if the resistor at pini1 of the Atmega48 connects to pin 7 and gets 5V(red wire) ?2. Does pin 1 go to the coil also (purple wire)?3. Is the pink wire connected to the coil middle pin also ?Thanks.

Ok, ive got a question... say that I wanted the entire thing you did, in my pocket, could i just connect the photodiodes to an LED and then to a power source, and then the same kinda thing would happen, coz im a big noob at this and dont really understand how it works?

I would like to do more or less the same thing and I have just a question. My project is to detect or not an object, not as yours with a distance sensing. See this video showing you what is my expected result: http://www.youtube.com/watch?v=X60p1GwNq3Q So when a object is detected to a fix distance, leds turn on, otherwise they are off.

You system work as below: 1) turn on IR emitter, 2) make an ADC convertion to determine how far is the object to detect, 3) turn off IR emitter, 4) turn on white leds in consequence of step 2 using a PWM command.

So, more the object is close to the IR emitter, more light is received by the IR sensor. I would like to replace the step 2 by something that tell me if the light received is more than a certain range or not. Do you have a idea how to do that without using ADC convertion? I will use and digital I/O on my microprocesor to treat with the information and make animations as in the video.

Thanks for you answer, Have a good day and make us dream a long time again with many new instructables of your amazing project!!!

sensacell makes capacitive touch sensor panels :) i make like this one with qprox sensor chips, but the price ..... this is the clip with IR sensors and Cap sensors:http://www.youtube.com/watch?v=rrYaz7jAaGQ

Hi there, and thank you. I understand what you want, but I think it might be difficult to make work. I understand that you want to do away with the ADC conversion all together and have a digital input to your microcontroller. This is possible by eliminating the analog input to the uC(microcontroller) by passing the analog signal from the sensor to a simple comparator, using a reference voltage of your choice. So that when the analog signal from the sensor gets above a certain voltage level, the comparator output goes high, which can be a digital signal to the uC. BUT, you will still want to try to push alot of current through the IR emitters so they will shine very bright, and thus give you a greater sensing distance and/or more reliable readings. But to do that you must 1.turn on IR emitter/s2.delay of something very short3.check uC pin HIGH or LOW4.turn off IR emitter/sLook at the datasheets for the emitters, I think some will allow you to push 1 amp! through it for 100 usecs. I push a little less than 100 mA through mine for 250 usecs. But its still enough current to fry the LED if left on at that level.

So all in all, yours is very doable. You will just have an extra level of electronic components before your signal is conditioned before going to the uC.

Good luck, feel free to keep asking. and thanks again for the feedback

I started with arduino as well, then moved into pure analog control (big mistake), and then went back to programming, except I just learned to program in C and go straight to the AVR instead of going through the Arduino. Its alot cheaper.